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I have a 2011 Sunesta 264 with 8.2 Mercruiser with Bravo III drive..I have been plagued with stern drive corrosion for two years. Keep it in the Allegheny River in a slip at the yacht club. Change anodes every year (fresh water-magnesium). Have repainted the out drive last year before season....still corroded by the end of the season. Sanded and painted lower unit again this year before season...primed and painted with Mercruiser products....pulled it out last week and again, significant corrosion and pitting on the lower unit. Is there any way to check the Mercathode system? Mercruiser suggests maybe a SECOND Mercathode system is needed. I don't know how to check the water around my slip for electrical potential. Thanks